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arXiv · 2011.12935

Short Bragg pulse spectroscopy for a paraxial fluids of light

Clara Piekarski·Wei Liu·Jeff Steinhauer·Elisabeth Giacobino·Alberto Bramati·Quentin Glorieux
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Abstract

We implement Bragg spectroscopy in a paraxial fluid of light. Analogues of short Bragg pulses are imprinted on a photon fluid by wavefront shaping using a spatial light modulator. We measure the dispersion relation and evidence a parabolic single-particle regime as well as a linear phonon regime even for very weakly interacting photons and low sound velocity. Finally, we report a measurement of the static structure factor, $S(k)$, and we demonstrate the presence of pair-correlated excitations, revealing indirectly the quantum depletion in a paraxial fluid of light.

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Clara Piekarski, Wei Liu, Jeff Steinhauer, Elisabeth Giacobino, Alberto Bramati, Quentin Glorieux. 2020-11-25. Short Bragg pulse spectroscopy for a paraxial fluids of light. https://doi.org/10.1103/physrevlett.127.023401

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